This article is cited in 11 papers

FIELDS, PARTICLES, AND NUCLEI

Failure of the collinear expansion in calculation of the induced gluon emission

P. Aurenche^a, B. G. Zakharov^b, H. Zaraket<sup>c

a</sup> Laboratoire d'Annecy-le-Vieux de Physique Théorique LAPTH, F-74941 Annecy-le-Vieux Cedex, France
^b Landau Institute for Theoretical Physics, Russian Academy of Sciences, 117940 GSP-1, Moscow, 117334, Russia
^c Faculty of Sciences (I), Lebanese University, Hadeth-Beirut, Lebanon

Abstract: We demonstrate that the collinear expansion fails in the case of gluon emission from a fast quark produced in $eA$ DIS. In this approximation the $N=1$ rescattering contribution to the gluon spectrum vanishes. We show that the higher-twist approach by Guo, Wang and Zhang [4, 5] based on the collinear expansion is wrong. The nonzero gluon spectrum obtained in [4, 5] those works is a consequence of an unjustified neglect of some important terms in the collinear expansion.

PACS: 12.38.Bx, 12.39.St, 13.87.Ce

Received: 28.04.2008

Language: English

 English version: Journal of Experimental and Theoretical Physics Letters, 2008, 87:11, 605–610

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